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IBM Lotus Notes/Domino fails to encode Square Brackets ( [ ] ) in computed field/text, allowing XSS


Software:
IBM Lotus Notes/Domino

Affected Version(s):
Tested in R6 should work in prior versions as well.

Author:
Juan C Calderon

Description:
An attacker can bypass native Lotus Notes HTML encoding in a computed value by 
adding square brackets to the beginning and end of a field of the following 
types computed, computed for display, computed when composed or a "computed 
text" element, Injecting HTML and JavaScript as desired.

NOTE: This won't work in editable fields

Trivial Example:
http://www.SomeLotusSite.com/FormReflectingURLValue?OpenForm&Field=[&lt;script&gt;.....&lt;/script&gt;]

Solution:
Validate user input for square bracket characters ( [ ] )  in data shown 
directly or indirectly in computed fields/texts